I presented a first impression introduction of my ENTREK ELK knife some time ago:
http://www.bladeforums.com/forums/showthread.php?t=690007
Although I haven't fully tested the ELK in the field yet, I've decided to put it in my bushfire evac kit due to its design, sturdy construction and corrosion resistance.
I also own an ENTREK Silhouette which I must admit is probably the most combat effective blade I own. My only gripe is that the handle feels just a tad short (I have medium sized hands and the hilt ends at the base of my closed hand). The plus side is that it feels very secure because of the sub-hilt design. However, part of me feels that there should at least be 2 inches of blunt steel at the base of the hilt just in case I want to knock my opponent unconscious. The other part acknowledges that this particular knife is purely an offensive attack weapon not really designed for defensive encounters anyway.
I was considering a Cobra and/or Survivor, but decided to get a Bark River SS Bravo 1 instead. While I like the utilitarian design of ENTREK knives, I simply can't resist an old fashioned, well made blade made with natural wood or stag handles.
Please keep us informed about the Elk and how it performs, I am considering buying one so a review would be great.